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Microfluidic Device



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Microwave Signals from Silicon Chip



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Electricity from Auto Exhausts



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High Tunability Range Crystals



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NASA Briefs

A system that estimates the global radius of curvature (GRoC) of a segmented telescope mirror has been developed by the Marshall Space Flight Center for use in a larger system that exerts precise control over the displacements of the mirror segments. This system makes it possible to control the GRoC of the mirror with sufficient precision to obtain the best possible image quality, and to impose a required wavefront correction on incoming or outgoing light. Click here for more info.

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Photonic Beetle



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Equations for Scoring Rules When Data Are Missing

A document presents equations for scoring rules in a diagnostic and/or prognostic artificial-intelligence software system of the rule-based inference- engine type. The equations define a set of metrics that characterize the evaluation of a rule when data required for the antecedence clause(s) of the rule are missing. The metrics include a primary measure denoted the rule completeness metric (RCM) plus a number of subsidiary measures that contribute to the RCM. The RCM is derived from an analysis of a rule with respect to its truth and a measure of the completeness of its input data. The derivation is such that the truth value of an antecedent is independent of the measure of its completeness. The RCM can be used to compare the degree of completeness of two or more rules with respect to a given set of data. Hence, the RCM can be used as a guide to choosing among rules during the rule-selection phase of operation of the artificial-intelligence system.

Posted in: Briefs, TSP

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